DE102018214106A1 - Direct injection internal combustion engine with cylinder-associated injectors - Google Patents

Abstract

The invention relates to a direct injection internal combustion engine having at least one cylinder (6), in which each cylinder (6) is equipped for the direct introduction of fuel into a cylinder-associated combustion chamber (6a) with an injection nozzle (2) which is moved by a movable closure body (7a). has forcibly controlled in the context of an injection at least two in a housing (2a) of the injection nozzle (2) provided combustion chamber side nozzle openings (3a) for introducing fuel into the combustion chamber (6a) connects to a fuel supply system and thus releases, wherein the movable closure body ( 7a) in a rest position, the at least two combustion chamber side nozzle openings (3a) separates from the fuel supply system and thus blocked and in a working position, the at least two combustion chamber side nozzle openings (3a) connects to the fuel supply system, characterized in that each combustion chamber side nozzle opening (3a) connecting a fuel channel (4), wherein at least one fuel channel (4) upstream and spaced from the associated combustion chamber side nozzle opening (3a) forked into at least two arm-shaped channel branches (4a, 4b), and each arm-shaped channel branch (4a, 4b) opens into a nozzle interior (2c) to form a closure body-side nozzle opening (3b), wherein at least one arm-shaped conduit branch (4a, 4b) is not a straight-line conduit branch (4a, 4b) having a constantly large flow cross-section.

Description

The invention relates to a direct injection internal combustion engine having at least one cylinder, wherein each cylinder is equipped for direct introduction of fuel into a cylinder-associated combustion chamber with an injection nozzle which has a movable closure body, the positively controlled in the context of injection at least two in a housing of the injection nozzle provided in the combustion chamber side nozzle openings for the purpose of introducing fuel into the combustion chamber with a fuel supply system connects and thus releases, the movable closure body in a rest position separates the at least two combustion chamber side nozzle openings from the fuel supply system and thus blocked and connects in a working position, the at least two combustion chamber side nozzle openings with the fuel supply system.

An internal combustion engine of the type mentioned is used as a motor vehicle drive. In the context of the present invention, the term internal combustion engine relates to diesel engines and gasoline engines, but also to hybrid internal combustion engines, i. Internal combustion engines, which are operated with a hybrid combustion method, and hybrid drives, which comprise at least one further torque source for driving a motor vehicle in addition to the internal combustion engine, for example a drive-connected to the engine or drive connected electric machine, which instead of the internal combustion engine or in addition to Internal combustion engine gives off power.

In the development of internal combustion engines, efforts are constantly being made to minimize fuel consumption and reduce pollutant emissions.

The problem is the fuel consumption, especially in gasoline engines. The reason for this is the principle of operation of the traditional gasoline engine, which is operated with a homogeneous fuel-air mixture, wherein the adjustment of the desired performance by changing the filling of the combustion chamber takes place, i. by quantity regulation. By adjusting a throttle valve provided in the intake tract, the pressure of the intake air downstream of the throttle valve can be more or less reduced. With a constant combustion chamber volume, the air mass, i. E. the quantity will be set. However, the quantity control by means of throttle valve has thermodynamic disadvantages due to the throttle losses in the partial load range.

One approach to dethrottling the Otto engine process is to develop hybrid combustion processes based on the adoption of technical features of the traditional diesel engine process, characterized by air compression, inhomogeneous mixing, auto-ignition and quality control. The low fuel consumption of the diesel engine results, among other things, from the quality control, in which the load is controlled by the injected fuel quantity.

The injection of fuel directly into the combustion chamber of the cylinder is regarded as a suitable measure for dethrottling the Otto engine operating method, with which the fuel consumption can be significantly reduced even in gasoline engines. In certain operating areas, then a quality control is used.

With the direct injection of the fuel into the combustion chamber can be realized in particular a stratified combustion chamber charge, which can contribute significantly to the dethrottling of the Otto engine operating method, since the internal combustion engine with the help of the stratified operation can be emaciated very far, which is particularly in part-load operation, i. In the lower and middle load range, when only small amounts of fuel are to be injected, it offers thermodynamic benefits.

The layer charge is characterized by a very inhomogeneous combustion chamber charge which can not be characterized by a uniform air ratio, but has both lean (λ> 1) mixture parts and rich (λ <1) mixture parts, wherein in the region of the ignition device an ignitable fuel air Mixture with comparatively high fuel concentration is present.

The inhomogeneity of the fuel-air mixture is also a reason that the known from the diesel engine process particle emissions in direct-injection gasoline engine are also relevant, whereas these emissions have almost no significance in traditional gasoline engine.

A direct injection internal combustion engine is also the subject of the present invention.

For the injection of the fuel, the mixture preparation in the combustion chamber, namely the mixing of air and fuel and the treatment including the evaporation, and the ignition of the treated mixture is comparatively little time available.

As a result of the direct injection of the fuel into the combustion chamber only a short time for reprocessing an ignitable and combustible fuel-air mixture is available direct injection internal combustion engines are much more sensitive to changes and deviations in the mixture formation, especially in the injection, as conventional internal combustion engines with intake manifold injection.

In principle, the aim is to distribute the fuel introduced into the cylinder within the scope of an injection as far as possible and evenly in the combustion chamber in the available time, and to homogenize the fuel-air mixture as far as possible before initiating the ignition. This advantageously affects the combustion and the formation of the pollutants, in particular the emissions of unburned hydrocarbons and soot, and also reduces fuel consumption.

In a direct injection gasoline engine, the mixture formation is further complicated by the fact that the initiation of the spark ignition an ignition device, such as a spark plug, is to be provided, and the injection nozzle is tuned to the ignition in the combustion chamber to arrange. Due to the very limited space available, the injector often becomes off-centered, i. spaced from the longitudinal axis of the cylinder arranged in the cylinder head.

To improve the mixture formation in direct-injection internal combustion engines further measures are required.

Against the background of the above, it is the object of the present invention to provide a direct injection internal combustion engine according to the preamble of claim 1, with which the mixture formation in the combustion chamber of a cylinder can be improved.

• - sich mindestens ein Kraftstoffkanal stromaufwärts und beabstandet zu der zugehörigen brennraumseitigen Düsenöffnung in mindestens zwei armförmige Kanalzweige aufgabelt, und
• - jeder armförmige Kanalzweig unter Ausbildung einer verschlusskörperseitigen Düsenöffnung in ein Düseninneres mündet, wobei mindestens ein armförmiger Kanalzweig kein geradliniger Kanalzweig ist, der einen konstant großen Strömungsquerschnitt aufweist.

This object is achieved by a direct injection internal combustion engine with at least one cylinder, in which each cylinder is equipped for direct introduction of fuel into a cylinder-associated combustion chamber with an injection nozzle, which has a movable closure body, the positively controlled in the context of injection at least two in a housing the injection nozzle provided combustion chamber side nozzle openings for the purpose of introducing fuel into the combustion chamber with a fuel supply system connects and thus releases, wherein the movable closure body separates the at least two combustion chamber side nozzle openings from the fuel supply system and thus locked in a rest position and in a working position, the at least two combustion chamber side nozzle openings with the fuel supply system connects, and which is characterized in that connects to each combustion-chamber-side nozzle opening a fuel passage, in which

• - At least one fuel passage upstream and spaced apart from the associated combustion-chamber-side nozzle opening aufgabelt in at least two arm-shaped channel branches, and
• - Each arm-shaped channel branch opens to form a closure body-side nozzle opening into a nozzle interior, wherein at least one arm-shaped channel branch is not a straight-line channel branch, which has a constantly large flow cross-section.

In a cylinder-associated injector of the internal combustion engine according to the invention, two or more arm-shaped duct branches, which are supplied with fuel from the nozzle interior using a fuel supply system, lead to a common, i. single fuel passage together, said fuel passage combustion chamber side has or forms a nozzle opening, i. through this combustion chamber side nozzle opening opens into the combustion chamber of the associated cylinder.

This objective design of the channel system or a channel of the injection nozzle has the technical effect that - when introducing fuel into the cylinder - the fuel flows located in the arm-shaped channel branches collide due to the merging of the channel branches according to the invention. As a result, the individual fuel flows are broken and enriched to some degree with air, i. atomized.

Thus, there is already a treatment of the fuel or the fuel-air mixture before entering the combustion chamber, namely already in the injection nozzle or the nozzle tip and before introduction into the combustion chamber. If the fuel then enters the combustion chamber via the nozzle opening on the combustion chamber side, a higher degree of atomization can be observed or detected in the formed fuel cloud than in the prior art according to which the collision of injection jets in the combustion chamber is known and used.

The inventive concept or design of the channel system or a channel also takes into account the fact that for the mixture preparation, namely the atomization of the fuel, the homogenization of the fuel-air mixture and the treatment including the evaporation, in a direct injection only little time is available.

In this respect, it proves to be extremely advantageous that the mixture preparation Moved according to the invention to a certain extent from the combustion chamber into the injection nozzle and is thus brought forward in time. The physical relationships in the breakdown of the individual fuel flows are based partly on cavitation effects and partly on the increase of the degree of turbulence in the fuel flow.

The fact that, according to the invention, at least one arm-shaped channel branch is not a straight-line channel branch with a constantly large flow cross-section, but extends arcuately or changes its shape in such a way that the provided flow cross-section in the flow direction, i. varies in the direction of the associated fuel channel, the treatment of the fuel or the fuel-air mixture before entering the combustion chamber is further forced or amplified.

Namely, the pressure ratios and the flow velocities vary in the at least one arm-shaped channel branch, whereby the fuel flow is more disrupted and enriched with air, i. is atomized. If necessary, cavitation effects occur, as a result of which the mixture preparation and thus the mixture formation are further improved.

With the internal combustion engine according to the invention, the object underlying the invention is achieved, namely a direct-injection internal combustion engine provided according to the preamble of claim 1, with which the mixture formation in the combustion chamber of a cylinder can be improved.

The fuel supply system may include a pump, a storage container, i. a fuel storage, and / or a fuel line, for example, the common supply line of a common rail system include. That is based in the context of the present invention on the separation of the fuel supply system, is justified by the fact that to complete the injection process, the openings are not closed regularly in the strict sense, but often only separated from the fuel supply.

The closure body, for example the spherical tip of a nozzle needle, may be actuated electromagnetically, piezoelectrically or otherwise, i. moved and transferred from one position to another position, the closure body can take several working positions regularly. The closure body does not necessarily have to be translationally displaced. A different, for example non-linear displacement of the closure body is possible in individual cases.

Embodiments of the internal combustion engine in which the at least two arm-shaped channel branches branch further upstream are advantageous.

Embodiments of the internal combustion engine in which at least one arm-shaped channel branch further branches upstream are also advantageous.

Embodiments of the internal combustion engine may be advantageous in which arm-shaped channel branches of different fuel channels communicate or are connected fluidically to each other.

Further advantageous embodiments of the internal combustion engine according to the invention are discussed in connection with the subclaims.

Embodiments of the internal combustion engine are advantageous in which each fuel channel upstream and spaced apart from the combustion chamber side nozzle opening aufgabelt in at least two arm-shaped channel branches.

In the present case, each fuel channel of the cylinder-associated injection nozzle is designed in the manner according to the invention, i. according to the two or more arm-shaped duct branches, which are fed with fuel from the nozzle interior using a fuel supply system, to a common, i. merge individual fuel channel.

Also advantageous are embodiments of the internal combustion engine in which at least one fuel channel upstream and spaced apart from the combustion chamber side nozzle opening aufgabelt in two arm-shaped channel branches.

According to the above embodiment, in at least one fuel channel only two arm-shaped channel branches lead to a common, i. single fuel channel together.

Also advantageous are embodiments of the internal combustion engine in which each fuel channel upstream and spaced apart from the combustion chamber side nozzle opening aufgabelt in two arm-shaped channel branches. In the present case, only two arm-shaped duct branches lead together in each fuel channel.

Embodiments of the internal combustion engine in which at least one arm-shaped channel branch tapers in the flow direction and thus has a flow cross-section which becomes smaller in the flow direction and provides the fuel are advantageous.

Also advantageous in this context are embodiments of the internal combustion engine in which at least one arm-shaped channel branch first tapers in the flow direction and then widens again, so that the flow cross-section provided varies in the flow direction.

Embodiments of the internal combustion engine in which at least one arm-shaped channel branch widens in the flow direction and thus has a flow cross-section which increases in the flow direction and provides the fuel are also advantageous.

Also advantageous in this context are embodiments of the internal combustion engine in which at least one arm-shaped channel branch initially widens in the flow direction and then tapers again, so that the flow cross-section provided varies in the flow direction.

Embodiments of the internal combustion engine in which at least one arm-shaped channel branch has a corkscrew shape at least in sections, are advantageous. is formed spirally.

In direct-injection internal combustion engines, in which each fuel channel upstream and spaced apart from the combustion chamber side nozzle opening aufgabelt in at least two arm-shaped channel branches, embodiments may be advantageous, which are characterized in that the at least two arm-shaped channel branches have different sized closure body side nozzle openings.

With the above embodiment, the circumstance can be taken into account that each arm-shaped channel branch opens into the nozzle interior at a different location, forming a closure body-side nozzle opening; regularly in a arranged on the nozzle tip blind hole. As a result, there are generally very different state variables of the fuel, in particular different pressures, at the closure body-side nozzle openings of the arm-shaped channel branches. By forming differently sized closure-body-side nozzle openings, the different state variables at the entrance into the arm-shaped channel branches can at least be reduced, if necessary compensated. The same considerations apply to the following embodiment.

In direct injection internal combustion engines, in which each fuel channel upstream and spaced apart from the combustion chamber side nozzle opening aufgabelt in at least two arm-shaped channel branches, embodiments may be advantageous, which are characterized in that the at least two arm-shaped channel branches have a different shape.

Embodiments of the internal combustion engine in which two arm-shaped channel branches of a fuel channel form an angle are advantageous α form.

The bigger the angle α is that form two arm-shaped channel branches of a fuel channel with each other, the more pronounced or more violent is the collision of the fuel flows located in the channel branches and the effect to be achieved according to the invention or is intended.

Embodiments of the internal combustion engine in which two arm-shaped channel branches of a fuel channel form an angle are advantageous α form with 10 ° <α <120 °.

Embodiments of the internal combustion engine in which two arm-shaped channel branches of a fuel channel form an angle are advantageous α form with 20 ° <α <105 °.

Embodiments of the internal combustion engine in which two arm-shaped channel branches of a fuel channel form an angle are advantageous α form with 35 ° <α <95 °.

Embodiments of the internal combustion engine in which two arm-shaped channel branches of a fuel channel form an angle are advantageous α form with 45 ° <α <85 °.

The angle α but can not be chosen arbitrarily large or executed, since the space is limited to the nozzle tip and regularly a plurality of nozzle openings or fuel channels are provided.

Namely advantageous embodiments of the internal combustion engine, in which the injection nozzle has at least seven or eight combustion chamber-side nozzle openings.

Embodiments of the internal combustion engine in which the injection nozzle has at least six nozzle openings on the combustion chamber can also be advantageous.

Embodiments of the internal combustion engine in which the injection nozzle has at least four or five nozzle openings on the combustion chamber are advantageous.

The three preceding embodiments take into account the fact that the number of nozzle openings affects the distribution of the introduced fuel in the combustion chamber of the cylinder. The more openings that are provided, the more space the fuel can distribute in the combustion chamber and the more effectively the fuel-air mixture can be homogenized.

The number of nozzle openings also depends on the amount of fuel that is to be introduced into a cylinder, but in particular also on the installation position of the injection nozzle in the cylinder and the geometry of the combustion chamber in the individual case.

Advantageous embodiments of the internal combustion engine, in which the movable closure body is translationally displaceable.

In the case of an injection nozzle which opens inward, a nozzle needle is regularly displaced translationally in order to transfer a closure body arranged at the combustion chamber end of the nozzle needle from the rest position into a working position and vice versa. In the working position, the closure body often releases a blind hole and thus connects the outgoing of the blind hole channels of the nozzle openings with the fuel supply system of the internal combustion engine.

Embodiments of the internal combustion engine in which the injection nozzle is equipped with a nozzle needle which can be displaced in the direction of a longitudinal axis in a nozzle needle guide are therefore also advantageous. The nozzle needle is connected to the movable closure body at a free end.

Embodiments of the internal combustion engine in which the injection nozzle has a spherical closure body are advantageous.

Embodiments of the internal combustion engine in which the injection nozzle has a convex closure body are advantageous.

Embodiments of the internal combustion engine in which the movable closure body is symmetrical are advantageous. The symmetry may be a symmetry with respect to the displacement path of the closure body or else the closure body is rotationally symmetrical, for example a sphere or spherical.

Embodiments of the internal combustion engine in which the movable closure body is asymmetrical can also be advantageous.

Embodiments of the internal combustion engine in which at least one fuel channel is rectilinear are advantageous. The straight-line design facilitates the manufacture of a fuel channel, for example by honing, a machining fine machining process, or by drilling, a machining production process.

However, embodiments of the internal combustion engine may also be advantageous in which at least one fuel channel is not a straight-line fuel channel which has a constantly large flow cross-section.

A fuel channel according to the invention can in principle be designed or designed as desired.

An injection nozzle according to the invention or the associated nozzle tip or plate can be produced, for example, with an additive manufacturing method in which the injection nozzle or nozzle tip is built up in layers. In this case, variants in which the injection nozzle or nozzle tip is produced at least also by means of 3D printing are advantageous.

Advantageous embodiments of the internal combustion engine, in which each cylinder is equipped with an ignition device for initiating a spark ignition.

• 1 schematisch im Querschnitt das Fragment eines Gehäuses einer als Einspritzvorrichtung dienenden Einspritzdüse einer ersten Ausführungsform der Brennkraftmaschine,
• 2a schematisch im Querschnitt den Kraftstoffkanal einer zweiten Ausführungsform der Brennkraftmaschine zusammen mit seinen zwei armförmigen Kanalzweigen,
• 2b schematisch im Querschnitt den Kraftstoffkanal einer dritten Ausführungsform der Brennkraftmaschine zusammen mit seinen zwei armförmigen Kanalzweigen,
• 2c schematisch im Querschnitt den Kraftstoffkanal einer vierten Ausführungsform der Brennkraftmaschine zusammen mit seinen zwei armförmigen Kanalzweigen,
• 2d schematisch im Querschnitt den Kraftstoffkanal einer fünften Ausführungsform der Brennkraftmaschine zusammen mit seinen zwei armförmigen Kanalzweigen, und
• 2e schematisch im Querschnitt den Kraftstoffkanal einer sechsten Ausführungsform der Brennkraftmaschine zusammen mit seinen zwei armförmigen Kanalzweigen.

In the following the invention will be described with reference to six embodiments and according to FIGS 1 . 2a . 2 B . 2c . 2d and 2e described in more detail. Hereby shows:

• 1 FIG. 2 shows schematically in cross-section the fragment of a housing of an injection nozzle serving as an injection device of a first embodiment of the internal combustion engine, FIG.
• 2a 3 shows schematically in cross-section the fuel passage of a second embodiment of the internal combustion engine together with its two arm-shaped channel branches,
• 2 B 3 shows schematically in cross-section the fuel passage of a third embodiment of the internal combustion engine together with its two arm-shaped channel branches,
• 2c 2 shows schematically in cross section the fuel channel of a fourth embodiment of the internal combustion engine together with its two arm-shaped channel branches,
• 2d schematically in cross section the fuel passage of a fifth embodiment of the internal combustion engine together with its two arm-shaped channel branches, and
• 2e schematically in cross section the fuel passage of a sixth embodiment of the internal combustion engine together with its two arm-shaped channel branches.

1 shows schematically in cross section the fragment of a housing 2a one as an injector 1 serving injector 2 a first embodiment of the internal combustion engine.

Every cylinder 6 is for direct introduction of fuel into a cylinder-associated combustion chamber 6a with an injection nozzle 2 fitted. At the in 1 illustrated injection nozzle 2 it is an inwardly opening multi-hole nozzle, in which several combustion chamber-side nozzle openings 3a are provided.

The injector 2 has a movable spherical closure body 7a which is at the free end of a nozzle needle 7 is arranged. The nozzle needle 7 is translationally displaceable in the direction of its longitudinal axis in a nozzle needle guide, whereby the closure body 7a positively controlled in the context of an injection several at the nozzle tip 2 B provided combustion chamber side nozzle openings 3a for the purpose of introducing fuel into the combustion chamber 6a connects with a fuel supply system and thus releases, ie activated.

In the 1 shown snapshot shows the translationally displaceable closure body 7a in the resting position. In the rest position, the closure body stores 7a in the nozzle tip 2 B and separates the combustion chamber side nozzle openings 3a from a fuel supply system of the internal combustion engine, whereby the nozzle orifices 3a are disabled with regard to the introduction of fuel.

By translational displacement of the nozzle needle 7 and thus the closure body 7a becomes the closure body 7a transferred from the rest position to a working position, in which the combustion chamber side nozzle openings 3a connected to the fuel supply system.

To each combustion chamber side nozzle opening 3a closes a fuel channel 4 on, with each fuel channel 4 upstream and spaced from the associated combustion chamber side nozzle opening 3a in two arm-shaped channel branches 4a . 4b pickles and each arm-shaped channel branch 4a . 4b forming a closure body side nozzle opening 3b in a nozzle inside 2c opens, in this case in a at the nozzle tip 2 B arranged blind hole 5 ,

The combustion chamber side nozzle openings 3a be via channels 4 . 4a . 4b and the blind hole 5 fueled.

The shape of each fuel channel 4 with its two arm-shaped channel branches 4a . 4b is in 1 only roughly simplified, ie simplified in its basic structure. The inventive design of the fuel channel 4 or the two arm-shaped channel branches 4a . 4b in detail can be the 2a to 2e remove.

2a shows schematically in cross section the fuel passage 4 a second embodiment of the internal combustion engine together with its two arm-shaped channel branches 4a . 4b ,

The fuel channel 4 upstream and spaced from the associated combustion chamber side nozzle opening into two arm-shaped channel branches 4a . 4b aufgabelt, in the present case is rectilinear and has a constantly large flow cross-section in the flow direction.

The two arm-shaped channel branches 4a . 4b taper in the flow direction and thus have a smaller in the flow direction flow cross-section.

2 B shows schematically in cross section the fuel passage 4 a third embodiment of the internal combustion engine together with its two arm-shaped channel branches 4a . 4b , It should only the differences to the in 2a Otherwise, reference will be made to FIG 2a , The same reference numerals have been used for the same components.

The two arm-shaped channel branches 4a . 4b expand in the flow direction and thus have a flow cross-section which increases in the flow direction.

2c shows schematically in cross section the fuel passage 4 a fifth embodiment of the internal combustion engine together with its two arm-shaped channel branches 4a . 4b , It should only the differences to the in 2 B Otherwise, reference will be made to FIG 2 B , The same reference numerals have been used for the same components.

The two arm-shaped channel branches 4a . 4b expand first in the flow direction and then taper again, so that the provided flow cross-section varies in the flow direction.

2d shows schematically in cross section the fuel passage 4 a fourth embodiment of the internal combustion engine together with its two arm-shaped channel branches 4a . 4b , It should only the differences to the in 2a Otherwise, reference will be made to FIG 2a , The same reference numerals have been used for the same components.

The two arm-shaped channel branches 4a . 4b initially taper and then expand again, so that the provided flow cross-section varies in the flow direction.

2e shows schematically in cross section the fuel passage of a sixth embodiment of the internal combustion engine together with its two arm-shaped channel branches.

The two arm-shaped channel branches 4a . 4b have a corkscrew shape (not shown).

LIST OF REFERENCE NUMBERS

1

Injector

2

injection

2a

Injector housing

2 B

Nozzle tip, free end

2c

nozzles Affairs

3a

combustion chamber side nozzle opening

3b

closure body side nozzle opening

4

Fuel channel

4a

arm-shaped channel branch

4b

arm-shaped channel branch

5

blind

6

cylinder

6a

combustion chamber

7

nozzle needle

7a

closure body

α

Angle between two arm-shaped channel branches

Claims (16)

Direct injection internal combustion engine having at least one cylinder (6), in which each cylinder (6) is provided for directly introducing fuel into a cylinder-associated combustion chamber (6a) with an injection nozzle (2) which has a movable closure body (7a) which is positively controlled in the context of an injection at least two in a housing (2a) of the injection nozzle (2) provided combustion chamber side nozzle openings (3a) for introducing fuel into the combustion chamber (6a) connects to a fuel supply system and thus releases, wherein the movable closure body (7a) in a Rest position which separates at least two combustion chamber side nozzle openings (3a) from the fuel supply system and thus obstructs and connects in a working position the at least two combustion chamber side nozzle openings (3a) with the fuel supply system, characterized in that at each combustion chamber side nozzle opening (3a) a fuel channel (3a) 4), wherein - at least one fuel channel (4) upstream and spaced to the associated combustion chamber side nozzle opening (3a) aufgabelt in at least two arm-shaped channel branches (4a, 4b), and - each arm-shaped channel branch (4a, 4b) to form a closure body side Nozzle opening (3b) opens into a nozzle interior (2c), wherein at least one arm-shaped channel branch (4a, 4b) is not a straight-line channel branch (4a, 4b) which has a constantly large flow cross-section. Direct injection internal combustion engine after Claim 1 , characterized in that each fuel channel (4) upstream and spaced from the combustion chamber side nozzle opening (3a) aufgabelt in at least two arm-shaped channel branches (4a, 4b). Direct injection internal combustion engine after Claim 1 or 2 , characterized in that at least one fuel channel (4) upstream and spaced from the combustion chamber side nozzle opening (3a) aufgabelt in two arm-shaped channel branches (4a, 4b). Direct injection internal combustion engine according to one of the preceding claims, characterized in that each fuel channel (4) upstream and spaced apart from the combustion chamber side nozzle opening (3a) aufgabelt in two arm-shaped channel branches (4a, 4b). Direct-injection internal combustion engine according to one of the preceding claims, characterized in that at least one arm-shaped channel branch (4a, 4b) tapers in the flow direction and thus has a flow cross-section becoming smaller in the flow direction and provides. Direct injection internal combustion engine according to one of the preceding claims, characterized in that at least one arm-shaped channel branch (4a, 4b) first tapers in the flow direction and then expands again, so that the flow cross-section provided varies in the flow direction. Direct-injection internal combustion engine according to one of the preceding claims, characterized in that at least one arm-shaped channel branch (4a, 4b) widens in the flow direction and thus has a flow cross section which increases in the flow direction and provides. Direct-injection internal combustion engine according to one of the preceding claims, characterized in that at least one arm-shaped channel branch (4a, 4b) initially expanded in the flow direction and then tapered again, so that the provided flow cross section varies in the flow direction. Direct-injection internal combustion engine according to one of the preceding claims, characterized in that at least one arm-shaped channel branch (4a, 4b) at least in sections has a corkscrew-shaped form. Direct injection internal combustion engine according to one of the preceding claims, wherein each fuel channel (4) upstream and spaced to the combustion chamber side nozzle opening (3a) forked into at least two arm-shaped channel branches (4a, 4b), characterized in that the at least two arm-shaped channel branches (4a, 4b ) have differently sized closure body side nozzle openings (3b). Direct injection internal combustion engine according to one of the preceding claims, wherein each fuel channel (4) upstream and spaced to the combustion chamber side nozzle opening (3a) forked into at least two arm-shaped channel branches (4a, 4b), characterized in that the at least two arm-shaped channel branches (4a, 4b ) have a different shape. Direct-injection internal combustion engine according to one of the preceding claims, characterized in that the injection nozzle (2) has at least five combustion chamber-side nozzle openings (3a). Direct-injection internal combustion engine according to one of the preceding claims, characterized in that the movable closure body (7a) is translationally displaceable. Direct injection internal combustion engine according to one of the preceding claims, characterized in that the injection nozzle (2) is equipped with a nozzle needle (7) displaceable in the direction of a longitudinal axis in a nozzle needle guide, the nozzle needle (7) being connected at one free end to the movable closure body (7a ) connected is. Direct-injection internal combustion engine according to one of the preceding claims, characterized in that at least one fuel channel (4) is rectilinear. Direct injection internal combustion engine according to one of Claims 1 to 14 , characterized in that at least one fuel passage (4) is not a rectilinear fuel passage (4) having a constantly large flow area.

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